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Ben Siller looked ridiculous on a recent afternoon, standing on a downtown Denver street corner with a giant device clamped to his face sniffing the air for odorous evidence of marijuana.

"What are you doing?" asked Jimmy Smith, owner of Higher Expectations dispensary south of Mississippi Avenue near the South Platte River.

In the dawning age of legal marijuana in Denver, the city is getting more and more complaints about the unmistakable odor wafting through the streets — a skunky, herbal scent that has prompted dozens of calls to the city's hotline.

That's when Siller with his Nasal Ranger device jumps into action.

An investigator with the Denver Department of Environmental Health, Siller for 26 years has been looking into odor complaints. They can range from smoke from a kitchen to industrial odors.